DOOCallbacks constructor
      
      DOOCallbacks({ 
    
    
- void onWelcome()?,
- void onPing()?,
- void onConfirmedSubscription()?,
- void onMessageReceived()?,
- void onMessageSent()?,
- void onMessageDelivered()?,
- void onMessageUpdated()?,
- void onPersistedMessagesRetrieved()?,
- void onMessagesRetrieved()?,
- void onConversationStartedTyping()?,
- void onConversationStoppedTyping()?,
- void onConversationIsOnline()?,
- void onConversationIsOffline()?,
- void onConversationResolved()?,
- void onError()?,
Implementation
DOOCallbacks({
  this.onWelcome,
  this.onPing,
  this.onConfirmedSubscription,
  this.onMessageReceived,
  this.onMessageSent,
  this.onMessageDelivered,
  this.onMessageUpdated,
  this.onPersistedMessagesRetrieved,
  this.onMessagesRetrieved,
  this.onConversationStartedTyping,
  this.onConversationStoppedTyping,
  this.onConversationIsOnline,
  this.onConversationIsOffline,
  this.onConversationResolved,
  this.onError,
});